package com.atguigu.flink.chapter07.state;

import com.atguigu.flink.bean.WaterSensor;
import org.apache.flink.api.common.state.ReducingState;
import org.apache.flink.api.common.state.ReducingStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/12/15 9:26
 */
public class Flink06_Keyed_State_Reduce {
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 20000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);
        env
            .socketTextStream("hadoop162", 9999)
            .map(line -> {
                String[] data = line.split(",");
                return new WaterSensor(data[0], Long.valueOf(data[1]), Integer.valueOf(data[2]));
            })
            .keyBy(WaterSensor::getId)
            .process(new KeyedProcessFunction<String, WaterSensor, String>() {
    
                private ReducingState<Integer> vcSumState;
                
                @Override
                public void open(Configuration parameters) throws Exception {
                    vcSumState = getRuntimeContext().getReducingState(new ReducingStateDescriptor<Integer>(
                        "vcSumState",
                        Integer::sum,
                        Integer.class));
                }
                
                @Override
                public void processElement(WaterSensor value,
                                           Context ctx,
                                           Collector<String> out) throws Exception {
                    vcSumState.add(value.getVc());
                    
                    out.collect(ctx.getCurrentKey() + "  " + vcSumState.get());
                }
            })
            .print();
        
        env.execute();
    }
    
}
